More than 2,500 town hall staff were paid over £100,000 last year, research has shown.
Despite the number earning in six figures falling by 11% between 2011 and 2012, 103 councils were still employing more staff on that level than before, the TaxPayers' Alliance said.
It added that one executive was handed almost £600,000.
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The Office for National Statistics said gross domestic product grew by just 0.1%.
William's comments came during a surprise appearance at an event scheduled for just his brother.
Matt Campbell, who collapsed just a few miles from the finish line, had hoped to raise £2,500.